IEC 63356-2:2024 is available as IEC 63356-2:2024 RLV which contains the International Standard and its Redline version, showing all changes of the technical content compared to the previous edition.

IEC 63356-2:2024 specifies design parameters and design values of an LED light source or related interface characteristics.
NOTE 1 Interface characteristics can cover interfaces between the LED light source and the luminaire or the controlgear, or the LED light source and additional attachments.
NOTE 2 Interfaces can be related to for example electrical, mechanical, or optical aspects.
This document does not cover interchangeability between products from different LED light source manufacturers.
NOTE 3 Interchangeability is covered by IEC 63356-1.
Lamp caps and lampholders specified in the IEC 60061 series are not within the scope of this document. This second edition cancels and replaces the first edition published in 2022. This edition constitutes a technical revision.
This edition includes the following significant technical changes with respect to the previous edition:
a) a new Clause 6 for circular LED modules with a circular light emitting surface for spot lighting has been added;
b) a new Clause 7 for LEDni modules with a rectangular shape and a circular light emitting surface has been added.